A Robust OFDM Receiver for DSRC Systems
نویسندگان
چکیده
OFDM PHY has been selected as North American DSRC standard (IEEE 802.11p). In this paper, we present a robust OFDM receiver suitable for DSRC systems. A synchronizer, a one-tap frequency domain equalizer (FDE), a pilot-based phase estimator and a Viterbi decoder mainly compose it. The equalizer uses normalized least-mean-square (NLMS) algorithm to track not only the variation of the DSRC channel in 5.9GHz band but also the residual frequency/phase errors that are not yet being entirely corrected by the synchronizer device. In order to keep the NLMS equalizer working well, we utilize a pilot-based phase estimator to help estimate them. For getting more improvement, a code decision directed demodulation (CD3) scheme assisted by the decoder outputs could be adopted to help track. The simulation results indicate that our proposed OFDM receiver works fairly well for two DSRC channel models. Key-Words: OFDM, DSRC, FDE, NLMS, CD3
منابع مشابه
An Efficient Scheme for PAPR Reduction of OFDM based on Selected Mapping without Side Information
Orthogonal frequency division multiplexing (OFDM) has become a promising method for many wireless communication applications. However, one main drawback of OFDM systems is the high peak-to-average power ratio (PAPR). Selected mapping (SLM) is a well-known technique to decrease the problem of high PAPR in OFDM systems. In this method, transmitter is obliged to send some bits named side informati...
متن کاملUsing WPT as a New Method Instead of FFT for Improving the Performance of OFDM Modulation
Orthogonal frequency division multiplexing (OFDM) is used in order to provide immunity against very hostile multipath channels in many modern communication systems.. The OFDM technique divides the total available frequency bandwidth into several narrow bands. In conventional OFDM, FFT algorithm is used to provide orthogonal subcarriers. Intersymbol interference (ISI) and intercarrier interferen...
متن کاملRobust Signal Detection and Timing Synchronization Algorithms for OFDM Based Wireless Systems
In this paper, we propose robust and efficient signal detection and symbol timing synchronization schemes applicable to preamble based wireless systems such as WLAN and WMAN-OFDM. The signal detection algorithm is based on detecting the increase in energy at the beginning of the preamble. For symbol timing synchronization, instead of using conventional normalized timing metric, a new algorithm ...
متن کاملImplementation of SDR-based high frequency range OFDM transceiver for Dedicated Short Range Communication
In The current scenario, a new protocol standard such as Dedicated short range Communication (DSRC) IEEE802.11p is implemented using with expensive hardware prototypes but still new physical layer and signal processing algorithms are not integrated on it .The DSRC radios for practical experiments are either commercial grade solutions which are developed for field tests, are rather expensive and...
متن کاملDesign of robust carrier tracking systems in high dynamic and high noise conditions, with emphasis on neuro-fuzzy controller
The robust carrier tracking is defined as the ability of a receiver to determine the phase and frequency of the input carrier signal in unusual conditions such as signal loss, input signal fading, high receiver dynamic, or other destructive effects of propagation. An implementation of tight tracking can be understood in terms of adopting a very narrow loop bandwidth that contradict with the req...
متن کامل